Arlington Industries FS420SCL 20 Cubic-inches Fan/Fixture Box for Suspended Ceilings, Metallic, 1-Pack SECURE MOUNTING - Support exit lights, security cameras, smoke and carbon monoxide detectors  and light fixtures up to 50 lbs. NO ASSEMBLY REQUIRED - Arlingtons new all-metal fixture box is a one-piece assembly that ships ready to install on a 24" suspended ceiling grid. PLATED STEEL CONTRICTION -Usable for Environmental Air Handling spaces. LOAD RATING - UL & CSA Rated: 50 lb fixture. SPECIFICATIONS - Weight: 1.8010 lbs/each - Height: 3.041" - Width: 25.000" - Style: 2" Box Depth - Usage:Suspended Ceilings